DICOTYLEDONS AS POISONOUS PLANTS 69 



can be kept in alcohol for winter study and many of them can be obtained in Europe and 

 in eastern and western America. 



2. Apply the delicate Dunstan and Carr test for aconitin. A dilute solution of the 

 alkaloid, even i part in 4000 parts of water, faintly acidulated with acetic acid, de- 

 posits a red crystalline precipitate or the addition of a few drops of solution of potassium 

 permanganate. This reaction is quite characteristic and extremely delicate. 



3. Morphin dissolved in concentrated sulphuric acid containing formaldehyde 

 (2 drops of 40 per cent, solution to 3 c.c. of sulphuric acid) produces a fine violet to 

 almost blue coloration (Marquis, 1900). 



4. Experimental work in pharmacology following the directions of Charles W. 

 Greene, Experimental Pharmacology, pages 15 and 48, can be made with morphin and 

 aconite. 



